EP1577146A2 - Système de commande de vitesse adaptatif avec limitation de l'accélération latérale - Google Patents

Système de commande de vitesse adaptatif avec limitation de l'accélération latérale Download PDF

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Publication number
EP1577146A2
EP1577146A2 EP05075612A EP05075612A EP1577146A2 EP 1577146 A2 EP1577146 A2 EP 1577146A2 EP 05075612 A EP05075612 A EP 05075612A EP 05075612 A EP05075612 A EP 05075612A EP 1577146 A2 EP1577146 A2 EP 1577146A2
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EP
European Patent Office
Prior art keywords
vehicle
speed
lateral acceleration
turn
path
Prior art date
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Granted
Application number
EP05075612A
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German (de)
English (en)
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EP1577146A3 (fr
EP1577146B1 (fr
Inventor
Robert A. Perisho Jr.
Jeremy S. Greene
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Delphi Technologies Inc
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Delphi Technologies Inc
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Priority to EP07075766A priority Critical patent/EP1872998B1/fr
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Publication of EP1577146A3 publication Critical patent/EP1577146A3/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K31/00—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator
    • B60K31/0066—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator responsive to vehicle path curvature
    • B60K31/0083—Vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator responsive to vehicle path curvature responsive to centrifugal force acting on vehicle due to the path it is following
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/14—Adaptive cruise control
    • B60W30/16—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/14—Adaptive cruise control
    • B60W30/16—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle
    • B60W30/17—Control of distance between vehicles, e.g. keeping a distance to preceding vehicle with provision for special action when the preceding vehicle comes to a halt, e.g. stop and go
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18145—Cornering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/12—Lateral speed
    • B60W2520/125—Lateral acceleration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2520/00—Input parameters relating to overall vehicle dynamics
    • B60W2520/14—Yaw
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2554/00—Input parameters relating to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2554/00—Input parameters relating to objects
    • B60W2554/40—Dynamic objects, e.g. animals, windblown objects
    • B60W2554/404—Characteristics
    • B60W2554/4041—Position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2554/00—Input parameters relating to objects
    • B60W2554/80—Spatial relation or speed relative to objects
    • B60W2554/804—Relative longitudinal speed

Definitions

  • the present invention generally relates to a vehicle which contains an adaptive cruise control ("ACC") system. Specifically, this invention relates to a method and system for controlling a vehicle having an ACC system.
  • ACC adaptive cruise control
  • Cruise control systems for automotive vehicles are widely known in the art.
  • the driver of a vehicle attains a desired vehicle speed and initiates the cruise control system at a set speed.
  • the vehicle then travels at the set speed until the driver applies the brakes or turns off the system.
  • ACC systems are not only capable of maintaining a set vehicle speed, but they also include object sensing technology, such as radar, laser, or other types of sensing systems, that will detect a vehicle in the path of the vehicle that contains the ACC (or other form of cruise control) system (i.e., "host vehicle”). Accordingly, ACC is an enhancement to traditional cruise control by automatically adjusting a set speed to allow a vehicle to adapt to moving traffic.
  • object sensing technology such as radar, laser, or other types of sensing systems
  • the ACC system Under normal driving conditions the ACC system is engaged with a set speed equal to a maximum speed that is desired by the vehicle driver, and the ACC system operates in a conventional cruise control mode. If the host vehicle is following too closely behind a vehicle in the path of the host vehicle ("in-path vehicle"), the ACC system automatically reduces the host vehicle's speed by reducing the throttle and/or applying the brakes to obtain a predetermined safe following interval. When the in-path vehicle approaches slow traffic and the ACC system reduces the speed of the host vehicle below a minimum speed for ACC operation, the ACC automatically disengages and the driver manually follows slower in-path vehicles in the slow traffic.
  • in-path vehicle approaches slow traffic and the ACC system reduces the speed of the host vehicle below a minimum speed for ACC operation
  • the driver When the slow traffic is no longer in front of the host-vehicle, the driver must manually accelerate the host vehicle to a speed above the minimum speed for ACC operation before the ACC system is able to resume acceleration to the set speed.
  • objects moving at approximately 30% (thirty percent) or less of the host vehicle's speed are disregarded for braking purposes (i.e., the vehicle's brakes are not applied, the throttle is not reduced, and no other action is taken to slow down the host vehicle).
  • Stop-and-go ACC systems are an enhanced form of ACC that overcome some of the shortcomings of ACC systems. Stop-and-go ACC systems enable the host vehicle to follow an in-path vehicle in slower traffic conditions such as stop and go traffic. Therefore, while ACC stop-and-go systems improve the performance of traditional ACC systems, both ACC and ACC stop-and-go systems still provide problems for the driver of the vehicle.
  • a first problem presented by ACC and ACC stop-and-go systems is that because there may be an abundance of out-of-path stationary targets encountered by a vehicle during a turn, braking for each of these targets can cause driver discomfort.
  • Current ACC and ACC stop-and-go systems are not capable of disregarding the stationary targets not within the vehicle's path (i.e., "out-of-path” targets).
  • An example is shown in Fig. 1, in which vehicle 102 utilizes a prior art ACC or ACC stop-and-go system. Vehicle 102 is shown at three (4) different times - time one ("T1"), time two ("T2"), time three ("T3 ”) and time four ("T4").
  • In-path indicator 103 highlights objects that are in the path of vehicle 102 as vehicle 102 travels.
  • in-path indicator 103 illustrates that stationary object 110 is within vehicle's 102 path.
  • Object 110 may be any stationary object, for example, a traffic light, a stopped vehicle, construction equipment, a person, an animal, a sign, or any other object. Since object 110 is in the path of vehicle 102, the ACC or ACC stop-and-go system contained by vehicle 102 appropriately instructs vehicle 102 to either brake or reduce its speed in some fashion. This situation, however, is an unnecessary braking situation because vehicle 110 is not a threat to vehicle 102 at T2.
  • vehicle 102 detects stationary object 112, as highlighted by in-path indicator 103. Because object 112 is in the path of vehicle 102, vehicle's 102 ACC or ACC stop-and-go system brakes and reduces vehicle's 102 speed. Object 112, however, like object 110, is non-threatening to vehicle 102. Therefore, in making turn 106, vehicle's 102 ACC or ACC stop-and-go system unnecessarily reduces the speed of vehicle 102. This excessive braking may annoy and provide discomfort to the driver of vehicle 102.
  • Fig. 1 Another problem presented by current ACC and ACC stop-and-go systems is that the systems' maintenance of a set cruise speed in turning situations may cause excessive lateral acceleration and the possible loss of control of the host vehicle.
  • Fig. 1 An example is shown in Fig. 1.
  • Vehicle 102 As vehicle 102 enters turn 106, maintaining the cruise speed may cause excessive lateral acceleration.
  • Vehicle 102 shown at T4, illustrates how the excessive lateral acceleration can cause vehicle's 102 tail to careen out of vehicle's 102 desired turn 106. Excessive lateral acceleration such as that described in this example may result in injury to the driver of vehicle 102 as well as to nearby vehicle drivers or pedestrians.
  • the method and system of the present invention provides smooth vehicle control in turning situations both by limiting lateral acceleration during the vehicle turn and by eliminating braking for out-of-path targets.
  • a method of controlling a vehicle having an adaptive cruise control system capable of obtaining the vehicle's lateral acceleration including the steps of determining when the vehicle is in a turn based on a detected change in the vehicle's lateral acceleration; and reducing the vehicle's speed according to the vehicle's position in the turn.
  • a method of controlling a vehicle including the steps of operating the vehicle in an adaptive cruise control mode such that the vehicle is traveling at a set speed; determining whether the vehicle is in a turn in the vehicle's path by detecting change in the vehicle's lateral acceleration; and when the vehicle is determined to be in the turn, reducing the vehicle's speed according to the vehicle's position in the turn, monitoring for objects and maintaining the vehicle's speed if an object is positioned out of the path of the vehicle.
  • the present invention provides a method of controlling a vehicle operating in an adaptive cruise control mode and traveling at a set speed, the method including the steps of estimating a path for the vehicle in a turn; associating the vehicle path with a first zone area, the first zone area including the turn; and reducing the vehicle's speed when a detected object is determined to be in the first zone area and maintaining the vehicle's speed when a detected object is determined to be outside of the first zone area.
  • a system for use in controlling a vehicle, the system including an adaptive cruise control system; a controller in communication with the adaptive cruise control system and capable of determining when the vehicle is in a turn, the controller operative to reduce the vehicle's speed according to the vehicle's position in the turn; at least one lateral acceleration sensor for generating a signal corresponding to the vehicle's lateral acceleration, the lateral acceleration sensor in electrical communication with the controller and operative to detect a change in the vehicle's lateral acceleration; and at least one object detection sensor for detecting an object in the path of the vehicle during the turn, the object detection sensor in electrical communication with the controller, wherein the controller includes control logic operative to determine whether the object is in the vehicle's path during the turn and ignoring the object for braking purposes when the object is not determined to be in the vehicle's path.
  • a method of controlling a vehicle in a turn including the steps of measuring the vehicle's speed; measuring the vehicle's lateral acceleration; estimating the radius of curvature of the vehicle's path based on the vehicle's speed and lateral acceleration; and when the combination of the vehicle's speed and the vehicle path's radius of curvature exceeds a predetermined maximum lateral acceleration limit, reducing the vehicle's speed.
  • Fig. 2 shows the inventive stop-and-go adaptive cruise control (ACC) system 210 of the present invention. While system 210 is described within the context of an ACC stop-and-go system, it is contemplated that system 210 may also be used in a traditional ACC system.
  • System 210 is implemented in host vehicle 200 that has braking system 212 and engine management system 214.
  • System 210 includes vehicle speed sensor 215 for measuring vehicle's 200 speed, lateral acceleration sensor 216 for measuring the acceleration of vehicle 200 in the direction of vehicle's 200 lateral axis in a turn, and yaw rate sensor 218 for measuring the rate that vehicle 200 is rotating about its vertical axis.
  • vehicle speed sensor 215 for measuring vehicle's 200 speed
  • lateral acceleration sensor 216 for measuring the acceleration of vehicle 200 in the direction of vehicle's 200 lateral axis in a turn
  • yaw rate sensor 218 for measuring the rate that vehicle 200 is rotating about its vertical axis.
  • System 210 also includes sensor 220 for generating a range signal corresponding to a distance between host vehicle 200 and a target, and a target range rate signal corresponding to a rate that the distance between host vehicle 200 and the target is changing.
  • Controller 222 is in electronic communication with sensors 215, 216, 218, 220 over communication bus 224.
  • Braking system 212 may include any braking system that is capable of reducing the speed of vehicle 200.
  • Such braking mechanisms include a transmission controller that is capable of downshifting a transmission of vehicle 200, a throttle that may be reduced to decrease the speed of vehicle 200, a brake booster controller equivalent to the vehicle's driver applying the brakes, etc.
  • Engine management system 214 may include any known vehicle component or system that may be used to adjust the acceleration of vehicle 200. Such components and/or systems may include a vehicle accelerator, a fuel and air intake control system, or an engine timing controller.
  • Sensor 220 may include any object detecting sensor known in the art, including a radar sensor (e.g., doppler or microwave radar), a laser radar (LIDAR) sensor, an ultrasonic radar, a forward looking IR (FLIR), a stereo imaging system, or a combination of a radar sensor and a camera system.
  • Sensor 220 functions to detect objects positioned in the path of vehicle 200.
  • in-path indicators 103, 303 depict sensor's 220 capability to detect an object in the path of vehicles 103, 303, respectively.
  • Sensor 220 may be used alone or in combination with other sensors, and depending on the type of sensor 220 used, sensor 220 may also be mounted alone or in multiples.
  • sensor 220 is front mounted so as to provide a wide sensor field of view (FOV) covering a minimum turn radius of ten (10) meters.
  • FOV wide sensor field of view
  • Sensor 220 may also be used in some embodiments of system 210 to gather additional information useful to controller 222 in determining the threat of the object to vehicle 200 and the appropriate actions to carry out. This additional information includes the target angle of the object relative to vehicle 200 and the yaw rate of the object relative to vehicle 200.
  • sensors other than sensor 220 may be provided to measure both the target angle and the yaw rate of the object (i.e., target).
  • Controller 222 may be a microprocessor-based controller such as a computer having a central processing unit, random access and/or read-only memory, and associated input and output busses. Controller 222 may be a portion of a main control unit such as vehicle's 200 main controller, or controller 222 may be a stand-alone controller. Controller 222 contains logic for enabling vehicle 200 to reduce its speed in a turn as well as to ignore objects positioned outside of a specific zone area, as will be described in further detail below with regards to Figs. 3 and 4.
  • Figs. 3 and 4 will now be used in conjunction to describe the method and system of the present invention.
  • vehicle 302 implementing system 210 (Fig. 2) of the present invention.
  • Vehicle 302 is shown in Fig. 3 at T1, T2, T3 and T4.
  • T1 vehicle 302 is displayed traveling at a cruise speed in the direction of arrow 309 on road 304.
  • controller 222 executes the logic steps illustrated in Fig. 4.
  • controller 222 stores the logic steps in memory as instructions to be executed by a processor.
  • controller 222 continuously monitors vehicle's 302 speed, lateral acceleration and yaw rate, each of which is provided to controller 222 as signals from sensors 215, 216, 218 (Fig. 2).
  • controller 222 obtains and stores vehicle's 302 lateral acceleration data, yaw rate data and vehicle speed data.
  • controller 222 uses a time lag filter to filter the raw lateral acceleration, yaw rate and vehicle speed data, and at step 406, controller 222 processes this filtered data.
  • Charted in Fig. 5 is the lateral acceleration of a vehicle in a turn versus the time it takes for the vehicle to complete the turn.
  • the X axis denotes the duration of time it takes the vehicle to complete the turn.
  • the Y axis denotes the lateral acceleration of the vehicle during the turn.
  • the actual path of a vehicle in the turn is illustrated as curve 500.
  • Curve 500 exhibits the path that a vehicle follows in a turn.
  • Curve 500 may be broken into three (3) sections - entry section 502, middle section 504 and exit section 506. At entry section 502 of turn 500, a vehicle enters the turn. At midsection 504 of turn 500, the vehicle completes the middle of the turn, and at exit section 506, the vehicle completes the turn.
  • Controller 222 may contain logic enabling it to use known characteristics of curve 500 to predict not only whether vehicle 302 is in a turn, but also to determine the position in which vehicle 302 is located in the turn, e.g., in the entry of a turn, in the middle of a turn, or in the exit of a turn.
  • Curve 520 depicts a vehicle's lateral acceleration during the turn illustrated by curve 500. At entry section 522 of curve 520, the vehicle's lateral acceleration increases from zero (0) Gs to about 0.15 Gs at a steady rate. At midsection 504 of curve 520, the lateral acceleration of the vehicle increases less over time and, when charted, has close to a constant curve.
  • the lateral acceleration of the vehicle reaches its maximum value, 0.20 Gs, during midsection 524 of curve 520.
  • the lateral acceleration becomes nearly constant before decreasing back to zero (0) as the turn is completed.
  • the following characteristics of a vehicle's lateral acceleration in a turn may be derived: 1) in the entry of a turn, the lateral acceleration of a vehicle is likely to rapidly increase from zero (0) Gs over time; 2) in the middle of a turn, the lateral acceleration of a vehicle is likely to show a constant increase before reaching a maximum value; and 3) in the exit of a turn, the lateral acceleration of a vehicle is likely to remain steady for a short period of time before decreasing.
  • These characteristics may be used to program controller 222 both to deduce when a vehicle is in a turning situation and to determine at what position the vehicle is in within the turn.
  • Controller 222 also uses other data obtained from vehicle 302 to predict whether vehicle 302 is in a turn.
  • This data includes vehicle's 302 yaw rate, which is obtained from yaw rate sensor 218; vehicle's 302 yaw rate of change, which controller 222 calculates based on the yaw rate; and vehicle's 302 speed, which is obtained from vehicle speed sensor 215.
  • Yaw rate basically indicates that vehicle 302 is turning on the axis that runs vertically through the center of the vehicle.
  • Vehicle speed data may be combined with lateral acceleration data to indicate the radius of curvature (ROC) or a road, i.e., how tight the turn is.
  • ROC radius of curvature
  • controller 222 determines at step 408 that vehicle 302 is not turning, then controller 222 continues to monitor vehicle's 302 lateral acceleration, yaw rate and vehicle speed by obtaining lateral acceleration, yaw rate and vehicle speed data at step 402. However, if controller 222 determines that vehicle 302 is turning, at step 410 controller 222 determines the position of vehicle 302 in the turn.
  • controller 222 determines vehicle's 302 position within the turn by using programmed instructions that recognize patterns exhibited in lateral acceleration data when a vehicle is in the entry of a turn, in the middle of a turn, or exiting a turn. After controller 222 determines at step 410 where in turn 306 vehicle 302 is positioned, controller 222 then instructs braking system 212 at step 412 to preemptively reduce vehicle's 302 speed so that vehicle's 302 lateral acceleration speed is reduced o a predetermined maximum limit according to vehicle's 302 position in the turn. For example, vehicle 302 may have been set at a cruise speed of fifty (50) miles per hour (MPH) at T2.
  • MPH miles per hour
  • controller 222 may contain program instructions that indicate that when vehicle 302 is in the entry of a turn, vehicle's 302 speed should be reduced inversely as the ROC of the turn is reduced. For the same speed, a tighter turn increases the lateral acceleration. For a constant curve, an increase in speed increases the lateral acceleration.
  • controller 222 may use vehicle's 302 lateral acceleration, yaw rate, yaw rate of change and speed data to estimate the path of vehicle 302 in turn 306 at step 414.
  • Path estimation is a projection of where vehicle 302 will be at the next sample time.
  • Vehicle's 302 path estimation is a vector whose longitudinal component is based on vehicle's 302 current speed plus the change in vehicle's 302 speed (delta speed).
  • the angle component of vehicle's 302 path estimation is based on vehicle's 302 lateral acceleration, lateral acceleration rate of change, yaw rate and yaw rate of change. The net result is an estimate of the new position of vehicle 302 at time zero (0) plus the change in time (delta time).
  • Controller 222 does not instruct braking system 212 to brake or reduce vehicle's 302 speed in turn 306 when an object detected by sensor 220 (Fig. 2) is outside of projected path boundaries 308a, 308b. Further, in the case that the projected path of vehicle 302 is not accurate and boundaries 308a, 308b are incorrectly determined, controller 222 may also determine a safety zone outside of path boundaries 308a, 308b.
  • the safety zone bounded by safety zone boundaries 310a, 310b, is similar to boundaries 308a, 308b in that controller 222 does not instruct braking system 212 to brake or reduce vehicle's 302 speed based upon sensor's 220 detection of an object outside of safety zone boundaries 310a, 310b.
  • controller 222 After controller projects the path of vehicle 302 at step 414, controller 222 obtains sensor data from sensor 220 at step 416 to determine whether stationary object 310 has been detected.
  • in-path indicator 303 depicts what, if anything, is detected by sensor 220 as being in the path of vehicle 302. As vehicle 302 enters turn 306, in-path indicator 303 highlights stopped vehicle 302, thus indicating at step 418 that vehicle's sensor 220 detects vehicle 302 as being in vehicle's 302 path. If sensor 220 does not detect target 310, then controller 222 re-executes the logic steps of Fig. 4 beginning at step 402.
  • controller 222 Upon detecting target 310, controller 222 verifies at step 420 that stopped vehicle 302 is valid by subjecting target 310 to persistence filtering.
  • the persistence filtering includes using vehicle's 302 yaw rate, yaw rate of change, speed, range (i.e., signal corresponding to a distance between vehicle 302 and target 310), range rate (i.e., signal corresponding to a rate that the distance between vehicle 302 and target 310 is changing), the angle of target 310 and the ROC of turn 306 to verify target 310.
  • Target 310 has a range rate equal to but opposite vehicle's 302 speed. By subtracting the range and angle data from vehicle's 302 speed, controller 222 can determine the actual speed and location of target 310. If the range decreases and the range rate changes inversely to vehicle's 302 delta speed, then target 310 is stationary.
  • controller 222 determines that target 310 is stationary multiple times, then target 310 is considered to be verified. If target 310 is not directly in front of vehicle 302, e.g., in a curve, then controller 222 performs the same verification test using vector geometry.
  • controller 222 When controller 222 has verified that stopped vehicle 302 is a valid target, controller 222 next determines at step 422 whether vehicle 302 out-of-path. Because vehicle 302 is neither within projected path boundaries 308a, 308b nor within safety zone boundaries 310a, 310b, controller 222 determines that vehicle 302 is out-of-path. Accordingly, whereas a prior art ACC or ACC stop-and-go system would cause vehicle 302 to reduce its speed because of detected vehicle 302, controller 222 eliminates system's 210 braking system at step 424 because stopped vehicle 302 is outside of both projected path boundaries 308a, 308b and safety zone boundaries 310a, 310b.
  • Controller 222 determines at step 410 that vehicle 302 is midway through turn 306 and adjusts vehicle's 302 speed according to programmed instructions that provide a predetermined lateral acceleration limit for vehicle 302 midway through its turn. After projecting vehicle's 302 path at step 414, controller 222 then obtains sensor signal data from sensor 220 at step 416. In-path indicator 303 highlights a corner of target 312, thus indicating that target 312 has been detected at step 418. Once controller 222 verifies at step 420 that target 312 is a valid target, controller 222 determines at step 422 whether target 312 is out-of-path.
  • inventive system 210 does not instruct braking system 212 to brake or otherwise reduce vehicle's 302 speed because target 312 is out-of-path. If controller 222 had determined that target 312 was in path, it would have instructed braking system 212 to initiate its brake routine.

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Driving Devices And Active Controlling Of Vehicle (AREA)
  • Regulating Braking Force (AREA)
  • Controls For Constant Speed Travelling (AREA)
  • Steering Control In Accordance With Driving Conditions (AREA)
  • Feedback Control In General (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Traffic Control Systems (AREA)
EP05075612A 2004-03-19 2005-03-14 Système de commande de vitesse adaptatif avec limitation de l'accélération latérale Active EP1577146B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP07075766A EP1872998B1 (fr) 2004-03-19 2005-03-14 Limitation d'accélération latérale automatique et rejet de cibles non menaçantes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US804745 2004-03-19
US10/804,745 US7512475B2 (en) 2004-03-19 2004-03-19 Automatic lateral acceleration limiting and non threat target rejection

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP07075766A Division EP1872998B1 (fr) 2004-03-19 2005-03-14 Limitation d'accélération latérale automatique et rejet de cibles non menaçantes

Publications (3)

Publication Number Publication Date
EP1577146A2 true EP1577146A2 (fr) 2005-09-21
EP1577146A3 EP1577146A3 (fr) 2006-08-16
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EP2050642A3 (fr) * 2007-10-16 2009-09-30 Hitachi Ltd. Dispositif de contrôle pour le freinage/la conduite et véhicule automobile disposant du dispositif
EP2405416A1 (fr) * 2010-07-08 2012-01-11 Volvo Car Corporation Procédé de régulation adaptative de vitesse et système de régulation de la vitesse des véhicules
CN104520779A (zh) * 2012-08-07 2015-04-15 卡特彼勒公司 用于为机器规划转弯路径的方法和系统
CN104520779B (zh) * 2012-08-07 2018-04-10 卡特彼勒公司 用于为机器规划转弯路径的方法和系统
CN106103228A (zh) * 2014-03-20 2016-11-09 奥托立夫开发公司 一种车辆控制系统
CN106103228B (zh) * 2014-03-20 2018-11-06 维宁尔瑞典公司 一种车辆控制系统
US9650043B2 (en) 2015-04-30 2017-05-16 GM Global Technology Operations LLC Real-time anticipatory speed control
TWI621075B (zh) * 2015-12-09 2018-04-11 Adaptive object classification device with parallel architecture and method thereof

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US7512475B2 (en) 2009-03-31
DE602005005373D1 (de) 2008-04-30
US7925416B2 (en) 2011-04-12
EP1577146A3 (fr) 2006-08-16
ATE457891T1 (de) 2010-03-15
DE602005005373T2 (de) 2009-04-02
EP1577146B1 (fr) 2008-03-19
ATE389559T1 (de) 2008-04-15
DE602005019479D1 (de) 2010-04-01
EP1872998B1 (fr) 2010-02-17
EP1872998A2 (fr) 2008-01-02
US20050209766A1 (en) 2005-09-22
US20090150039A1 (en) 2009-06-11
EP1872998A3 (fr) 2008-01-09

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